TARFU: How's the overall stability of the OS? Any experience using Firefox with Windows 10 (it's my browser of choice)?
What's the learning curve like switching from Win 7? Win 7 just feels intuitive (I've been using Windows since 3.1) and Windows 8/8.1 didn't feel "right". Just weird, like Twilight Zone/alternate dimension version of Windows.
How do the rest of your GOG games run on Windows 10? Any problems?
The OS has been very stable for me. That is besides a blue screen of death in the beginning, but that was because of me using outdated drivers from the laptop's driver disc back when I didn't have a proper internet, out of desperation. If you're wondering, I sat at a café and downloaded Windows 10 over there and then came back home.
As for the learning curve, the learning curve in Windows 8 itself is just a mere 5 minutes if the Modern interface got you away. The learning curve will apply to the new features of the system, such as multiple desktops and search and the notification center, etc. If you're talking about the Start Menu and this kinda stuff, they should work like its Windows 7 peer but with Windows 10 Universal apps, and unlike its 7 peer, it should be scalable. The only thing you'll need to learn is using the new Settings alongside the old Control Panel. The Settings is more of a section that is friendly for touch and desktops alike.
As for the rest of my GOG games: Beneath a Steel Sky worked well, and so is Rise of the Triad, Freedom Planet, SimCity 2000, The Witcher 2 and Torchlight are all working on the new system. If you're curious about other games not on GOG, I only ran to Final Fantasy VIII as a game that I wasn't able to get working on 10.